CAT 312B Water Pump

Hi all, I have this machine on an island in the Bahamas. Last time I was out there the water pump started to squeal a little. I noticed it was loosing a bit of water as well. I have looked on line and found that the pump has a bearing in it. Questions- is it easy to change bearing i.e any special tools etc.............if bearing has gone would it leak water or have I got a leak else where?

I didn't have time to look at it much before I left last time as it started when I was parking up the machine to come back to the UK.

Any help would be much appreciated....Cheers

CAT 312B Water Pump